#include <stdio.h>
#include "20155315head.h" 
int main(void){
int a, b, i=1;
//for(i;i<5315;i++)
//{printf("\n");}
printf("enter two numbers:");
scanf("%d %d",&a, &b);
printf("add:%d\n",add(a, b));
printf("sub:%d\n",sub(a, b));
printf("mul:%d\n",mul(a, b));
printf("div:%lf\n",div(a, b));
return 0;
}
